Charles d



(No Model.)

O. D. MILLER.

FILE GRINDING MACHINE. NO, 248,874.

WIT'NEEE Elq" VENTCIR.

UNiTi-:n STATES ATENT Price CHARLES D. MILLER, OF VVARVVIUK, RHODE ISLAND.

FILE-GRINDING MACHINE.

i SPECIFICATION forming part of Letters Patent No. 248,874, dated November 1, 1881.

Application filed June 24, 1881. (No model.)

To all whom it may concern Be it known that I, CHARLES D. MILLER, of Warwick, in the county ot' Kent and State of Rhode Island, have invented a new and useful lmprovernent in File-Grinding Machines; and I do hereby declare that the following specification, taken in connection with the accompanying drawings, forming a part of the same, is a i'ull, clear, and exact description thereof.

My invention rclates to a m ,chine for grinding files, which embodies a rotating stone or equivalent, a plate or apron for holding the files during` the griuding` operation, a pair' of i'riction-rollsagainstwhich the said plate takes beariug, and a yoke or block on which the said rolls are mounted.

My improvement consists in mounting the friction-rolls in the yoke so that they can be retreated laterally clear of the plate or apron which holds the files, and can be projected laterally to support said apron.

It also consists in arranging the yoke containing the movable friction-rolls so that said yoke can be adjusted to and from the stone.

The objects of my improvement are, by arranging the friction-rolls so that they can be retreated clear ot' the apro'n and also he projected behind the same to allow ot' the apron being turned or reverse'd, in order that the work may be inspected or removed and new work introduced and yet give the apron a support (luring such time, and, by arranging the yoke so that it can be moved to and from the stone, to provide for the proper adjustment ot' the apron to the stone as the latter wears away.

Referring to the drawings, Figure lrepre' sents, in front elevation, a machine embodying my improvement. Fig. 2 shows a portion of the same in side eleva'tion and partial section. Fig. 3 represents a portion of the machine in plan. Fig. 4 shows an enlarged view of a portion of the machine in elevation. Fig. 5 represents certain details of construction.

A is the frame of the machine, upon which the various parts are mounted.

Bis the stone or equivalent, which is mounted to rotate in bearings Z), Fig. 2.

O is the plate or apron, in which the files c, Fig. 3, are held while being ground. This apron is secured to the lower end of a rod, O',

the upper end of which is provided with a ball pivoied in a socket, C2, Fig. 1, which socketmember is attached to a cross-head, D, in any preferred manner. For the purpose of adj usting the apron O in a proper plane with relation to the stone B, however, l prefer that the socket-member O2 be engaged by a screw' provided with a hand-wheel, (J, Figs. 1 and 5, by meansof which the socket C2, and consequently the rod O' and apron O can be moved horizontally. 'The cross-head and apron have reciprocating vertic il motions imparted to them by a screw, E, the said screw being rotated by a pulley, F, secnred to a shafr,f, which bears a be\'el-gear,f', meshing with a gear, c, upon the end of the screw. Also mounted upon the shaftf are two loose pulleys, F' F2, which are respectirely engaged by a cross-belt and a straight belt when the shaftfis not being revolved. By means of proper shipping mechanism, G, these belts are brought into engagcment alternately with the pulley F, and the screw E is revolved in opposite directions, thereby producing the upward and downward movements of the apron O.

H is the block or yoke, which is mounted to slide on the frame A, its adjustment with relation to the stone B being effected by a screw, H'. This yoke carries tubular portions E2, in which are mounted sliding blocks h, and secured to these blocks are studs h', one of which is shown in Fig. 4, upon which are mounted the friction-rolls J J. When in normal position the rolls J J project from the inner faces of the portions B2 of the yoke H, as shown in ,Figs 1 and 3 and by dotted lines in Fig. 4,

and fnrnish a support for the apron O during' the operation ot' grinding, the said apron being pressed against the rolls by the stone.

ln order that the files may be quickly removed from engagement with the stone, should occasion require, and in order that a convenient arrangement may be provided whereby the work may be inspected at any stage, or the files be removed and replaced by others, mechanism is provided for retreating the rolls clear of the apron-that is,iucreasing their distance from each other, as shown in Fig. 4, so that the apron may be swung out and reversed. The retreatof the rollsisaccomplished by pressing upon a foot-lever, K, pivoted to the frame of the machine, as shown in llgs. 1, 2, and 4. This lever is connected to a rod, K', which engages a pair ot' bell-crank levers, 1(2, pivoted to the yoke. the said levers being in engagement with the sliding bloeks h, as shown in Fig. 4. By depressing the outer end of the foot-lever the rolls are retreated, and when said lever is released the rolls are returned to their normal position by springs L L, whieh bear upon the yoke and upon the levers K2 K2 to support the apron.

The Yolte H is adjustable with relation to the stone B only within certain limits. In order, theret'ore` that stones ot' various sizes may be used, and that a large stone ma)` be employed eontinuously until it has been woru away to the minimum size, the stone B and its bearings b b are made adjustable with relation to the 'yolte II and the l'rietion-rolls mounted thereon. For the purpose of this adjustment a hand-wheel attaehed to a shat't, M, Fig. 1, is employed. The shat't "M bears a pair ot' bevelgears, N N, which mesh with a pair ot' bevelgears, O O, seeured to the ends ot' serews P P upon both sidt s ot' the machine, as shown in Figs. 1 and 4. The screws I) P engage'lugs p p, secured to the beariugs b Z) of the stone, asshown in Fig. 2. \Vlie|i,tl1erelore, the handwheel ou the shal't M is turned the stone and its bearings are adjusted with relation to the Iyoke and its rolls. \Vhen this adjustment is etfeeted the pullev Q, whieh drives the stone, is changed in size, or its belt varied in length, or both, as may be desired.

As is usual, the machine is provided with means for laterally reciprocating the stone B during its revolution, the said meanseonsisting of an arm, R, fixed upon the frame of the machine and en'gaging a grooved cam, S, secured to the grindstone-shaft, as shown in Fig. 1.

From the toregoing description it will be understood that the friction-rollsJJsupport the apron while the files are being ground; that said rolls ean be retreated to allow the apron to be swnng out and reversed when the work is to be inspeeted, removed, or new Work put in; that the said rolls ean be projeeted to support the apron While the work is being inspeeted, removed, or put in; that the yoke H and its friction-rolls can be adjusted to and from the stone, and that the stone and its bearings ean be adjnsted with relation to the yoke and its rolls.

That I elaim as my invention, and desire to secure by Letters Patent. is-

1. In a grimling-maehine, the combination, with the yoke, of frietion rolls mounted thereon so that they eanbe retreated and projected la'terally, and suitable means for Operating said rolls, substantially as and for the purposes speoified.

2. In a grindingmaehine, the combination of the adjustable yoke H, the frietion rolls J J, mounted thereon so that they can be retreated andprojeeted laterally, and suitable means for Operating said rolls, substantially as and for the purposes speeitied.

CHARLES l). MILLER.

Wituesses:

EDsoN SALISBURY J oNns, GEORGE M. OADY. 

